Display device

• US 10,474,260 B2
• Filed: 08/31/2016
• Issued: 11/12/2019
• Est. Priority Date: 11/20/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Ide, Tatsuya
• Primary Examiner(s): Powers, Laura C
• Application Number:
  US15/252,673
• Publication Number:
  US 20170147115A1
• Time in Patent Office: 1,168 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

The display device having a touch panel includes a detection electrode forming a touch panel and arranged on one surface of a display cell, a protective layer covering the detection electrode, and an optical film adhered to the protective layer, wherein a first surface of the protective layer adjacent to the optical film has a smaller water contact angle compared to a second surface of the protective layer adjacent to the display cell. The first surface of the protective layer is preferred to have a half or less the water contact angle compared to the second surface of the protective layer.

Claims

1. A display device comprising:

a detection electrode forming a touch panel and arranged on a first surface of a display cell;

a protective layer covering and being in contact with the detection electrode and the first surface of the display cell; and

an optical film directly adhered on a first surface of the protective layer;

wherein the first surface of the protective layer has a larger surface roughness compared to a second surface of the protective layer opposing to the first surface of the protective layer.

2. The display device according to claim 1, wherein the first surface of the protective layer has twice or more and ten times or less surface roughness compared to the second surface of the protective layer.

3. The display device according to claim 1, wherein the surface roughness of the first surface of the protective layer is 5 nm or more and 20 nm or less.

4. The display device according to claim 1, wherein the optical film is a polarizing plate.

5. The display device according to claim 1, wherein the display cell is a liquid crystal display panel.